黄土高原重力侵蚀的地形与岩性组合因子分析

An analysis to the combined factors of topography and lithology in the gravitational erosion of Loess Plateau

黄土高原地区严重的重力侵蚀,是该区的主要侵蚀方式之一。本文运用计量地貌学方法,对该区重力侵蚀的地形因子进行了分析,提出了重力侵蚀的地形因子值概念,编制了全区区域临空面高度以及地形因子等值线图,给出了不同岩性组合条件的重力浸蚀强度地形因子指标。最后还探讨了重力侵蚀强度的区域特征。

The grievous gravitational erosion on Loess Plateau is the major ero- sion type of the region.The paper,with the quantitative geornorpholo- gical method,having analysed the topographical factor in gravitational erosion,raised the concept of topographical factor value,worked out the isograms of regional height facing vacancy for the area and the topogra- phy factor,proposed topographical index of gravitational erosion strength under different combining condition of lithology,it also explores the re- gional nature of gravitational erosion strength.